In Search of the Elusive Residential

Transcription

1 Energy Demand and Energy Efficiency: What are the Policy Levers? or In Search of the Elusive Residential Demand Function Michael Hanemann Arizona State University & UC Berkeley

2 The question being posed The question being posed is not: what is an efficient way of pricing energy? Instead, the questions are: If you want to reduce residential energy use, how can you do this? More generally, what is the residential demand curve for energy? 2

3 The elusive demand function for energy To be sure, there is a huge literature in which economists have estimated residential demand curves for energy. I myself have participated in such exercises. The question is: Are the estimated demand curves meaningful? Do they reliably tell us what future demand will be a month from now, a year from now, or five years from now, either with or without some policy intervention? I am not sure that they do. I have the same doubt about commercial demand functions for energy And I have the same doubt about residential demand functions for water. 3

4 Why do I think the demand curve is problematic? (1) For most residential users, their consumption of energy is invisible to them. They have no way of knowing what quantity they are consuming at the time of consumption. They have no idea what the price is, either, at the time of consumption. (2) Their consumption of energy is mediated through the physical structure of the building they live in and the hardware in it. Some of those things may not be under their control. Even when they are controllable, those things won t be changed often or instantaneously. 4

5 Compare to other users Household transportation Rate of fuel consumption is visible how often do you fill the car Industrial/commercial Depending on the industry, decision makers may be highly aware of enrgu use. E.g., fuel managers for trucking companies or airlines pay attention to achieving savings of 1-2% in fuel use savings that are invisible to home owners 5

6 Lack of data Before I go on to describe what I think is a better approach to modeling the residential demand for energy, I should acknowledge that whatever we do is constrained by the availability of data. The data needed for the approach that I advocate are not generally available. The implication: we need to push to gain access to better data 6

7 The question of policy levers A key question underlying policy: Do we want to reduce energy use by moving along a given demand curve? Or, do we want to reduce it by shifting the demand curve inwards? The conventional approach to policy focuses on the former getting the price right (raising the price appropriately) so as to reduce demand. The strategy in California over the past 40 years has aimed more at shifting the demand curve inwards by non-price initiatives. The recent interest in nudges for example, messaging electricity users on their use relative to that of others aims at shifting the demand curve inwards. 7

8 The two issues converge How to shift the demand curve inwards How to conceptualize the demand curve and approach modeling it. 8

9 Breaking down the data The key to making sense of residential energy demand is to decompose it. There are several ways to do this: By end use Conditional on housing type Newly built home versus existing home or by home vintage Conditional on housing characteristics Conditional on types of appliances installed Conditional on user type Household characteristics (size, income, etc) for occupant Household characteristics for neighborhood (sorting model, peer effects) Conditional on timing of an event Change of ownership, new owner vs existing owner Conditional on policy intervention price change, rationing, etc Conditional on receipt of a nudge 9

10 The target of the model Conventional economics models the demand for a commodity as thought the consumer is constantly re-optimizing his consumption to match current circumstances. An alternative approach would focus on modeling when and how demand changes. The assumption is that most of the time, the consumer just repeats what he normally does. He has some existing pattern of demand habitual demand However, sometimes circumstances change sufficiently to attract his attention. He then considers whether to make a change. In the latter case, there are two things to model: When does a change occur? If a change occurs, what change will be selected? 10

11 An analysis framed around changes How many households confront change (participate in experiment, etc)? What percent of total users? What is the possible nature of the response Change in appliances (refrigerator, dishwasher,etc) Retrofit part of house air conditioning, heating, lighting, kitchen Change in behavior use appliances less What percent of their usage might be changed The idea is to put an upper bound on how much change in usage could occur, over what time period. 11

12 Analyses framed around changes Literature identifying different price elasticities for small price changes versus large price changes. Suggests the importance of salience. Small price changes not salient, hardly likely to be noticed, therefore evoke little or no response. Large price charges likely to be salience. Literature on messaging Comparing your use to that of others like you Shown to induce reductions on the order of 3-4% in electricity use Messaging with electricity bill Field experiments with conservation measures 12

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14 A frontier approach to estimation Standard statistical modeling aims to estimate an average E{y x} y = Xβ + ε, where ε ranges from negative to positive An alternative focuses on estimating the best-practice frontier y = Xβ + ε, where ε 0. In some formulations ε may be a function of variables, such as price (the higher the price, the closer actual practice is to best practice?) Requires individual level data. 14

15 To illustrate the potential of improved data for investigating policy approaches, I turn to a debate about the determinants of energy efficiency in California. 15

16 The California Issue In early 1970 s, California was one of 5 or 6 states in which activists were pushing for reform of electric utility regulation. It was the only state in which those aspirations were fully realized. In , California created an institutional framework for statewide regulation of energy efficiency. an infrastructure for research on energy efficiency. By 1980, it had also created a culture of energy efficiency. 16

17 Two Energy Agencies in California The California Public Utilities Commission (CPUC) was formed in 1890 to regulate natural monopolies, like railroads, and later electric and gas utilities. The California Energy Commission (CEC) was formed in 1974 to regulate the environmental side of energy production and use. Now the two agencies work very closely, particularly to delay climate change. The Investor-Owned Utilities, under the guidance of the CPUC, spend Public Goods Charge money (rate-payer money) to do everything they can that is cost effective to beat existing standards. The Publicly-Owned utilities (20% of the power), under loose supervision by the CEC, do the same. 17

18 CEC Responsibilities Both Regulation and R&D California Building and Appliance Standards Started 1977 Updated every few years Siting Thermal Power Plants Larger than 50 MW Forecasting Supply and Demand (electricity and fuels) Research and Development ~ $80 million per year CPUC & CEC are collaborating to introduce communicating electric meters and thermostats that are programmable to respond to time-dependent electric tariffs

22 Rate Decoupling Introduced in 1978 for natural gas, and 1982 for electricity. Utilities submit their revenue requirements and estimated sales to CPUC. CPUC sets rates. Any shortfall recovered later from customers. Any excess revenue credited back to customers. In 2007, Decoupling Plus. New system of and penalties to drive utilities beyond state s 10-year energy savings targets. Result: Higher electricity prices in California Lower electricity consumption. Due not just to movement along demand cure, but also to an inward shift in the demand curve. 22

25 This is known as the Rosenfeld Curve Dr. Art Rosenfeld became Governor Brown s energy adviser in 1974, and subsequently has served as the intellectual mentor to energy policymakers in California. Under Governor Schwarzenegger he served for 8 years as a California Energy Commissioner. This curve has attracted a growing attention from mainstream energy economists. There have been several attempts to deconstruct it. The most convincing, so far, is by Anant Sudarshan for a Stanford PhD thesis (2010). 25

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27 Sudarshan estimates a set of (log) demand functions for households in California and other states using the RECS household level data for 2001 and

28 The conditioning variables for household types 28

29 Coefficient estimates by type 29

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31 Sudarshan s result 31

32 This shows that, with regard to the difference in per capita electricity use between California and the rest of the US in , the differences in households types account for more than the policy initiatives in place in California at that time. But, this is the wrong question. The real question is why did demand level off in California in the mid-1970s? 32

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34 Distinctive features of study Household level billing data for every home in county, Kwh purchased per billing cycle, whether house uses electric heat, whether enrolled in renewable energy program Combine with weather data Merge with 2008 & 2009 credit bureau data Household income, ethnicity, age of head of household, number of people, year house built, size of house, whether has a pool. Merge with voter registration data Merge with marketing data 34

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37 Movers Costa & Kahn did a separate analysis of houses where the occupant moved during 2008 or They know the energy used by the family in its old home and its new home. They know the energy used in the home with th eold occupant and the new occupant. They exploit this information to identify the influence of the house versus the people on energy use 37

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40 Conclusion We need much more disaggregated data. With such data we can understand what is going with regard to energy use. With that understanding we can target policy interventions price and non-price in a manner more likely to produce effective results. Without such data, we have a hollow understanding and are severely limited in the effectiveness of our interventions. 40

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